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中間人星星
Author:
rogertsui
GeoGebra
New Resources
圓的切線方程
龙形曲线-分形龙
平行線的判定
双心四边形
科赫雪花
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初中八年级奥数：面积与面积法
圓的內接四邊形
神之作
盾牌~~~~
圓錐曲線的光學性質
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Ratios
Tree Diagrams
Median Line
Quadrilaterals
Quadratic Functions